public override bool Validate()
{
if (this.contract == null)
{
throw new ContractValidateException("No contract!");
}
if (this.db_manager == null)
{
throw new ContractValidateException("No this.db_manager!");
}
if (this.contract.Is(ExchangeWithdrawContract.Descriptor))
{
ExchangeWithdrawContract contract = null;
try
{
contract = this.contract.Unpack <ExchangeWithdrawContract>();
}
catch (InvalidProtocolBufferException e)
{
throw new ContractValidateException(e.Message);
}
byte[] owner_address = contract.OwnerAddress.ToByteArray();
if (!Wallet.IsValidAddress(owner_address))
{
throw new ContractValidateException("Invalid address");
}
if (!this.db_manager.Account.Contains(owner_address))
{
throw new ContractValidateException("account[" + owner_address.ToHexString() + "] not exists");
}
AccountCapsule account = this.db_manager.Account.Get(owner_address);
if (account.Balance < CalcFee())
{
throw new ContractValidateException("No enough balance for exchange withdraw fee!");
}
ExchangeCapsule exchange = null;
try
{
exchange = this.db_manager.ExchangeFinal.Get(BitConverter.GetBytes(contract.ExchangeId));
}
catch (ItemNotFoundException e)
{
throw new ContractValidateException("Exchange[" + contract.ExchangeId + "] not exists", e);
}
if (!account.Address.Equals(exchange.CreatorAddress))
{
throw new ContractValidateException("account[" + owner_address.ToHexString() + "] is not creator");
}
byte[] first_token_id = exchange.FirstTokenId.ToByteArray();
byte[] second_token_id = exchange.SecondTokenId.ToByteArray();
long first_token_balance = exchange.FirstTokenBalance;
long second_token_balance = exchange.SecondTokenBalance;
byte[] token_id = contract.TokenId.ToByteArray();
long token_quantity = contract.Quant;
long other_token_quantity = 0;
if (this.db_manager.DynamicProperties.GetAllowSameTokenName() == 1)
{
if (!token_id.SequenceEqual(COMPARE_CHARICTOR) && !TransactionUtil.IsNumber(token_id))
{
throw new ContractValidateException("token id is not a valid number");
}
}
if (!token_id.SequenceEqual(first_token_id) && !token_id.SequenceEqual(second_token_id))
{
throw new ContractValidateException("token is not in exchange");
}
if (token_quantity <= 0)
{
throw new ContractValidateException("withdraw token quant must greater than zero");
}
if (first_token_balance == 0 || second_token_balance == 0)
{
throw new ContractValidateException("Token balance in exchange is equal with 0,"
+ "the exchange has been closed");
}
BigDecimal first_balance = new BigDecimal(first_token_balance);
BigDecimal second_balance = new BigDecimal(second_token_balance);
BigDecimal bigTokenQuant = new BigDecimal(token_quantity);
if (token_id.SequenceEqual(first_token_id))
{
other_token_quantity = second_balance.Multiply(bigTokenQuant)
.DivideToIntegralValue(first_balance).ToInt64();
if (first_token_balance < token_quantity || second_token_balance < other_token_quantity)
{
throw new ContractValidateException("exchange balance is not enough");
}
if (other_token_quantity <= 0)
{
throw new ContractValidateException("withdraw another token quant must greater than zero");
}
double remainder = second_balance.Multiply(bigTokenQuant)
.Divide(first_balance, 4, RoundingMode.HalfUp).ToDouble();
remainder -= other_token_quantity;
if (remainder / other_token_quantity > 0.0001)
{
throw new ContractValidateException("Not precise enough");
}
}
else
{
other_token_quantity = first_balance.Multiply(bigTokenQuant)
.DivideToIntegralValue(second_balance).ToInt64();
if (second_token_balance < token_quantity || first_token_balance < other_token_quantity)
{
throw new ContractValidateException("exchange balance is not enough");
}
if (other_token_quantity <= 0)
{
throw new ContractValidateException("withdraw another token quant must greater than zero");
}
double remainder = first_balance.Multiply(bigTokenQuant)
.Divide(second_balance, 4, RoundingMode.HalfUp).ToDouble();
remainder -= other_token_quantity;
if (remainder / other_token_quantity > 0.0001)
{
throw new ContractValidateException("Not precise enough");
}
}
}
else
{
throw new ContractValidateException(
"contract type error,expected type [ExchangeWithdrawContract],real type[" + this.contract.GetType().Name + "]");
}
return(true);
}
public override bool Execute(TransactionResultCapsule result)
{
long fee = CalcFee();
try
{
ExchangeWithdrawContract ew_contract = this.contract.Unpack <ExchangeWithdrawContract>();
AccountCapsule account = this.db_manager.Account.Get(ew_contract.OwnerAddress.ToByteArray());
ExchangeCapsule exchange = this.db_manager.ExchangeFinal.Get(BitConverter.GetBytes(ew_contract.ExchangeId));
byte[] first_token_id = exchange.FirstTokenId.ToByteArray();
byte[] second_token_id = exchange.SecondTokenId.ToByteArray();
long first_token_balance = exchange.FirstTokenBalance;
long second_token_balance = exchange.SecondTokenBalance;
byte[] token_id = ew_contract.TokenId.ToByteArray();
long token_quantity = ew_contract.Quant;
byte[] other_token_id = null;
long other_token_quantity = 0;
BigInteger first_balance = new BigInteger(first_token_balance);
BigInteger second_balance = new BigInteger(second_token_balance);
BigInteger quantity = new BigInteger(token_quantity);
if (token_id.SequenceEqual(first_token_id))
{
other_token_id = second_token_id;
other_token_quantity = (long)BigInteger.Multiply(second_balance, quantity);
other_token_quantity = (long)BigInteger.Divide(other_token_quantity, first_balance);
exchange.SetBalance(first_token_balance - token_quantity, second_token_balance - other_token_quantity);
}
else
{
other_token_id = first_token_id;
other_token_quantity = (long)BigInteger.Multiply(first_balance, quantity);
other_token_quantity = (long)BigInteger.Divide(other_token_quantity, second_balance);
exchange.SetBalance(first_token_balance - other_token_quantity, second_token_balance - token_quantity);
}
long new_balance = account.Balance - CalcFee();
if (token_id.SequenceEqual(COMPARE_CHARICTOR))
{
account.Balance = new_balance + token_quantity;
}
else
{
account.AddAssetAmountV2(token_id, token_quantity, this.db_manager);
}
if (other_token_id.SequenceEqual(COMPARE_CHARICTOR))
{
account.Balance = new_balance + other_token_quantity;
}
else
{
account.AddAssetAmountV2(other_token_id, other_token_quantity, this.db_manager);
}
this.db_manager.Account.Put(account.CreateDatabaseKey(), account);
this.db_manager.PutExchangeCapsule(exchange);
result.ExchangeWithdrawAnotherAmount = other_token_quantity;
result.SetStatus(fee, code.Sucess);
}
catch (ItemNotFoundException e)
{
Logger.Debug(e.Message);
result.SetStatus(fee, code.Failed);
throw new ContractExeException(e.Message);
}
catch (InvalidProtocolBufferException e)
{
Logger.Debug(e.Message);
result.SetStatus(fee, code.Failed);
throw new ContractExeException(e.Message);
}
return(true);
}
public async Task <TransactionExtention> ExchangeWithdraw(ExchangeWithdrawContract contract)
{
return(await _grpcClient.ExchangeWithdrawAsync(contract));
}
